16
Figure 3: Cold water combination valve (for 400 & 500ltr)
Figure 4: Schematic installation
Back flow prevention
Device (if fitted)
NOTE:
If a device that prevents
backflow is installed on
the cold water supply to
the PRV then a means of
accommodating expansion
due to local warming of the
pipe is recommended to be
fitted between the Device
and PRV.
NOTE:
A backflow prevention Device may include check valves, a water meter or an additional PRV
T&P relief
valve
Element/
controls
housing
Primary flow
Primary return
Secondary
return
To hot outlets
Expansion
vessel
Pressure reducing
valve
Pressure relief
valve
Inlet
Drain valve
Tundish
Discharge pipe
Isolation
valve
Mains water
supply
6 or 10 bar adjustable
pressure reducing valve
direction
Mains water in
8 or 13 bar pressure
relief valve
28mm compression connections
To cylinder
Pressure relief
discharge
Pressure gauge
connections (one
each side)
Locking Screw
Adjuster
direction
